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<A href="introduction6.htm">Debugging Tools for Windows (WinDbg, KD, CDB, NTSD)</A> &gt; <A href="debugging_techniques.htm">Debugging Techniques</A> &gt; <A href="specialized_debugging_techniques.htm">Specialized Debugging Techniques</A> &gt; <A href="kernel_streaming_debugging.htm">Kernel Streaming Debugging</A> &gt; <A href="analyzing_a_video_stream_stall.htm">Analyzing a Video Stream Stall</A> &gt; </div>
	<div id="winchm_template_title">Interpreting Bug Check 0xCB</div>
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	<div id="winchm_template_content"><div id="mainSection"><p>The most common bug check code associated with debugging a video stream stall is Bug Check 0xCB (DRIVER_LEFT_LOCKED_PAGES_IN_PROCESS).  For a detailed list of its parameters, see <a href="#Bookmark1767"><b>Bug Check 0xCB</b></a>.  </p>
<p>The message displayed when the bug check occurs will point to Ks.sys as the cause.</p>
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<pre>Use !analyze -v to get detailed debugging information.
BugCheck CB, {f90c6ae0, f9949215, 81861788, 26}
Probably caused by : ks.sys ( ks!KsProbeStreamIrp+333 )</pre>
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<p>As suggested, use <a href="#Bookmark2224"><b>!analyze -v</b></a> to get more detailed information.</p>
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<pre>kd&gt; !analyze -v
DRIVER_LEFT_LOCKED_PAGES_IN_PROCESS (cb)
Caused by a driver not cleaning up completely after an I/O.
When possible, the guilty driver's name (Unicode string) is printed on
the bugcheck screen and saved in KiBugCheckDriver.
Arguments:
Arg3: 81861788, A pointer to the MDL containing the locked pages.</pre>
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<p>Now, use the <a href="#Bookmark2432"><b>!search</b></a> extension to find the virtual addresses that are associated with the MDL pointer.</p>
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<pre>kd&gt; !search 81861788
Searching PFNs in range 00000001 - 0000FF76 for [FFFFFFFF81861788 - FFFFFFFF81861788]

Pfn      Offset   Hit      Va       Pte
- - - - - - - - - - - - - - - - - - - - - - - - - - -
000008A7 00000B0C 81861788 808A7B0C C020229C
00000A04 00000224 16000001 80A04224 C0202810
...
00001732 000009B4 81861788 817329B4 C0205CC8</pre>
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<p>For each virtual address (VA) found, look for an IRP signature. Do this by using the <a href="#Bookmark1985"><b>dd</b></a> command with the VA minus one DWORD.</p>
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<pre>kd&gt; dd 808A7B0C-4 l4
808a7b08  f9949215 81861788 00000026 00000000
kd&gt; $ Not an Irp
kd&gt; dd 80A04224-4 l4
80a04220  00000000 00000000 00000000 00000000
kd&gt; $ Not an Irp
kd&gt; dd 817329B4-4 l4
817329b0  01900006 81861788 00000070 ffa59220
kd&gt; $ Matches signature</pre>
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<p>After a VA with an IRP signature has been found, use the <a href="#Bookmark2366"><b>!irp</b></a> extension to find out what driver is pending on this IRP.  </p>
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<pre>kd&gt; !irp 817329b0 7
Irp is active with 2 stacks 2 is current (= 0x81732a44)
 Mdl = 81861788 System buffer = ffa59220 Thread 00000000:  Irp stack trace.
&gt;[  e, 0]   1  1 81a883c8 81ae6158 00000000-00000000    pending
 \Driver\TESTCAP
                        Args: 00000070 00000000 002f4017 00000000</pre>
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<p>In this case, \Driver\TESTCAP is the likely cause of the bug check.  </p></div></div>	
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